E2049 Label declaration not allowed in interface part (Object Pascal)

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This error occurs when you declare a label in the interface part of a unit.

unit Produce;
interface
label 99;
implementation
begin
99:
end.

It is just illegal to declare a label in the interface section of a unit.

unit Solve;
interface
implementation
label 99;
begin
99:
end.

You have to move it to the implementation section.